EWG's Tap Water Database — 2019 UPDATE



York Water Company

Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20126.14 ppb25254.53 ppb - 8.85 ppb
20135.50 ppb28283.92 ppb - 8.74 ppb
20145.60 ppb16163.50 ppb - 7.40 ppb
20155.14 ppb16163.14 ppb - 7.30 ppb
20165.89 ppb20203.70 ppb - 9.30 ppb
20175.69 ppb20204.30 ppb - 7.10 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2012-02-09CHAZS E. PRO4.76 ppb
2012-05-07CHAZS, E PRO5.98 ppb
2012-05-07STEWARTSTOWN5.92 ppb
2012-05-07YORKHANA TUR6.56 ppb
2012-05-07HOKE MILL6.77 ppb
2012-05-07W MANCESTER6.47 ppb
2012-05-07N YORK PUMPH6.77 ppb
2012-05-07MT ZION PUMP6.43 ppb
2012-05-07LOGANVILLE P5.53 ppb
2012-08-07CHAZS E. PRO7.03 ppb
2012-08-07STEWARTSTOWN8.85 ppb
2012-08-07YORKANA TURK7.30 ppb
2012-08-07HOKE MILL AB7.60 ppb
2012-08-07W. MANCHESTE6.82 ppb
2012-08-07N. YORK PUMP8.29 ppb
2012-08-07MT ZION PUMP8.25 ppb
2012-08-07LOGANVILLE P6.54 ppb
2012-11-07CHAZS E PROS4.63 ppb
2012-11-07STEWARTSTOWN4.90 ppb
2012-11-07YORKANA TURK4.70 ppb
2012-11-07HOKE MILL AB4.72 ppb
2012-11-07W MANCHESTER4.53 ppb
2012-11-07N YORK PUMPH4.74 ppb
2012-11-07MT ZION PUMP4.69 ppb
2012-11-07LOGANVILLE P4.61 ppb
2013-02-07HOKE MILL AB4.11 ppb
2013-02-07W MANCHESTER3.98 ppb
2013-02-08CHAZS E PROS4.16 ppb
2013-02-08YORKANA TURK4.06 ppb
2013-02-08N YORK PUMPH3.98 ppb
2013-02-08MT ZION PUMP3.92 ppb
2013-02-08LOGANVILLE P4.49 ppb
2013-02-11STEWARTSTOWN4.58 ppb
2013-05-07CHAZS E PROS5.14 ppb
2013-05-07STEWARTSTOWN5.39 ppb
2013-05-07YORKANA TURK5.43 ppb
2013-05-08HOKE MILL5.32 ppb
2013-05-08W MANCHESTER4.44 ppb
2013-05-08N YORK PUMPH5.18 ppb
2013-05-08MT ZION PUMP5.09 ppb
2013-05-08LOGANVILLE P4.84 ppb
2013-08-07HOKE MILL7.28 ppb
2013-08-08W MANCHESTER6.84 ppb
2013-08-08N YORK PUMPH7.54 ppb
2013-08-08MT ZION PUMP7.56 ppb
2013-08-09CHAZS E PROS7.52 ppb
2013-08-09YORKANA TURK7.27 ppb
2013-08-12STEWARTSTOWN8.74 ppb
2013-08-12LOGANVILLE P6.93 ppb
2013-11-07STEWARTSTOWN5.41 ppb
2013-11-07W MANCHESTER4.82 ppb
2013-11-07LOGANVILLE P4.73 ppb
2013-11-11CHAZS E PROS5.28 ppb
2014-02-1114021711-0024.40 ppb
2014-02-1114021711-0043.50 ppb
2014-02-1214021711-0015.10 ppb
2014-02-1214021711-0034.30 ppb
2014-05-0714052045-0016.00 ppb
2014-05-0814052045-0025.90 ppb
2014-05-0814052045-0035.70 ppb
2014-05-0814052045-0045.50 ppb
2014-08-1114081341-0016.50 ppb
2014-08-1114081341-0027.40 ppb
2014-08-1114081341-0036.50 ppb
2014-08-1114081341-0046.40 ppb
2014-11-0714110761-0015.60 ppb
2014-11-0714110761-0025.70 ppb
2014-11-0714110761-0045.70 ppb
2014-11-0714110761-0035.40 ppb
2015-02-10124975803.67 ppb
2015-02-10124975923.14 ppb
2015-02-11124975743.90 ppb
2015-02-11124975863.20 ppb
2015-05-08128639234.84 ppb
2015-05-11128639294.92 ppb
2015-05-11128639354.83 ppb
2015-05-11128639414.25 ppb
2015-08-11132464386.20 ppb
2015-08-11132464447.30 ppb
2015-08-11132464506.90 ppb
2015-08-11132464566.60 ppb
2015-11-10136156255.90 ppb
2015-11-10136156315.80 ppb
2015-11-10136156375.20 ppb
2015-11-10136156435.60 ppb
2016-02-10139676873.70 ppb
2016-02-10139676933.90 ppb
2016-02-10139676993.70 ppb
2016-02-10139677053.80 ppb
2016-05-06143840324.70 ppb
2016-05-11143840434.90 ppb
2016-05-11143840494.70 ppb
2016-05-11143840375.00 ppb
2016-08-10148846476.20 ppb
2016-08-10148846576.50 ppb
2016-08-10148846626.40 ppb
2016-08-10148846526.30 ppb
2016-08-30150559518.90 ppb
2016-08-30150559598.70 ppb
2016-08-31150559659.30 ppb
2016-08-31150559717.60 ppb
2016-11-07153485796.10 ppb
2016-11-07153485976.10 ppb
2016-11-09153485855.90 ppb
2016-11-10153485915.30 ppb
2017-02-07157737484.60 ppb
2017-02-07157736974.30 ppb
2017-02-07157737364.30 ppb
2017-02-08157737424.60 ppb
2017-05-09162345856.00 ppb
2017-05-09162345745.90 ppb
2017-05-09162345795.80 ppb
2017-05-09162345906.10 ppb
2017-08-08167057326.50 ppb
2017-08-10167057446.10 ppb
2017-08-10167057386.80 ppb
2017-08-10167057507.10 ppb
2017-11-08171427446.60 ppb
2017-11-08171427865.80 ppb
2017-11-08171427685.50 ppb
2017-11-08171427625.70 ppb
2017-11-08171427745.60 ppb
2017-11-08171427804.90 ppb
2017-11-09171427505.80 ppb
2017-11-09171427565.70 ppb